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Fix whirl effect and avoid excessive property lookups 

Scale the whirl effect to affect the entire image and flip the whirl
direction like Scratch 1.4 does. Image dimensions are also now stored
in variables to avoid looking them up thousands of times in a row.
dev
djdolphin 2016-06-11 22:21:34 -04:00
rodzic 6cdc861926
commit 3d7ea257f1
1 zmienionych plików z 56 dodań i 40 usunięć
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96
objects.js
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@ -3135,16 +3135,19 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
function transform_fisheye (imagedata, value) {
var pixels, newImageData, newPixels, centerX, centerY,
x, y, dx, dy, r, angle, srcX, srcY, i, srcI;
w, h, x, y, dx, dy, r, angle, srcX, srcY, i, srcI;
w = imagedata.width;
h = imagedata.height;
pixels = imagedata.data;
newImageData = ctx.createImageData(imagedata.width, imagedata.height);
newImageData = ctx.createImageData(w, h);
newPixels = newImageData.data;
centerX = imagedata.width / 2;
centerY = imagedata.height / 2;
centerX = w / 2;
centerY = h / 2;
value = Math.max(0, (value + 100) / 100);
for (y = 0; y < imagedata.height; y++) {
for (x = 0; x < imagedata.width; x++) {
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
dx = (x - centerX) / centerX;
dy = (y - centerY) / centerY;
r = Math.pow(Math.sqrt(dx * dx + dy * dy), value);
@ -3156,8 +3159,8 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
srcX = x;
srcY = y;
}
i = (y * imagedata.width + x) * 4;
srcI = (srcY * imagedata.width + srcX) * 4;
i = (y * w + x) * 4;
srcI = (srcY * w + srcX) * 4;
newPixels[i] = pixels[srcI];
newPixels[i + 1] = pixels[srcI + 1];
newPixels[i + 2] = pixels[srcI + 2];
@ -3168,36 +3171,46 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
}
function transform_whirl (imagedata, value) {
var pixels, newImageData, newPixels, centerX, centerY,
var pixels, newImageData, newPixels, w, h, centerX, centerY,
x, y, radius, scaleX, scaleY, whirlRadians, radiusSquared,
dx, dy, d, factor, angle, srcX, srcY, i, srcI;
w = imagedata.width;
h = imagedata.height;
pixels = imagedata.data;
newImageData = ctx.createImageData(imagedata.width, imagedata.height);
newImageData = ctx.createImageData(w, h);
newPixels = newImageData.data;
centerX = imagedata.width / 2;
centerY = imagedata.height / 2;
centerX = w / 2;
centerY = h / 2;
radius = Math.min(centerX, centerY);
whirlRadians = radians(value);
if (w < h) {
scaleX = h / w;
scaleY = 1;
} else {
scaleX = 1;
scaleY = w / h;
}
whirlRadians = -radians(value);
radiusSquared = radius * radius;
for (y = 0; y < imagedata.height; y++) {
for (x = 0; x < imagedata.width; x++) {
dx = x - centerX;
dy = y - centerY;
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
dx = scaleX * (x - centerX);
dy = scaleY * (y - centerY);
d = dx * dx + dy * dy;
if (d < radiusSquared) {
factor = 1 - (Math.sqrt(d) / radius);
angle = whirlRadians * (factor * factor);
sina = Math.sin(angle);
cosa = Math.cos(angle);
srcX = Math.floor((cosa * dx - sina * dy) + centerX);
srcY = Math.floor((sina * dx + cosa * dy) + centerY);
srcX = Math.floor((cosa * dx - sina * dy) / scaleX + centerX);
srcY = Math.floor((sina * dx + cosa * dy) / scaleY + centerY);
} else {
srcX = x;
srcY = y;
}
i = (y * imagedata.width + x) * 4;
srcI = (srcY * imagedata.width + srcX) * 4;
i = (y * w + x) * 4;
srcI = (srcY * w + srcX) * 4;
newPixels[i] = pixels[srcI];
newPixels[i + 1] = pixels[srcI + 1];
newPixels[i + 2] = pixels[srcI + 2];
@ -3208,19 +3221,22 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
}
function transform_pixelate (imagedata, value) {
var pixels, newImageData, newPixels, x, y,
srcX, srcY, i, srcI;
var pixels, newImageData, newPixels, w, h,
x, y, srcX, srcY, i, srcI;
w = imagedata.width;
h = imagedata.height;
pixels = imagedata.data;
newImageData = ctx.createImageData(imagedata.width, imagedata.height);
newImageData = ctx.createImageData(w, h);
newPixels = newImageData.data;
value = Math.floor(Math.abs(value / 10) + 1);
for (y = 0; y < imagedata.height; y++) {
for (x = 0; x < imagedata.width; x++) {
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
srcX = Math.floor(x / value) * value;
srcY = Math.floor(y / value) * value;
i = (y * imagedata.width + x) * 4;
srcI = (srcY * imagedata.width + srcX) * 4;
i = (y * w + x) * 4;
srcI = (srcY * w + srcX) * 4;
newPixels[i] = pixels[srcI];
newPixels[i + 1] = pixels[srcI + 1];
newPixels[i + 2] = pixels[srcI + 2];
@ -3231,15 +3247,15 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
}
function transform_mosaic (imagedata, value) {
var i, pixels, newImageData, newPixels, srcI;
var pixels, i, l, newImageData, newPixels, srcI;
pixels = imagedata.data;
newImageData = ctx.createImageData(imagedata.width, imagedata.height);
newPixels = newImageData.data;
value = Math.round((Math.abs(value) + 10) / 10);
value = Math.max(0, Math.min(value, Math.min(imagedata.width, imagedata.height)));
for (i = 0; i < pixels.length; i += 4) {
srcI = i * value % pixels.length
for (i = 0, l = pixels.length; i < l; i += 4) {
srcI = i * value % l
newPixels[i] = pixels[srcI];
newPixels[i + 1] = pixels[srcI + 1];
newPixels[i + 2] = pixels[srcI + 2];
@ -3249,7 +3265,7 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
}
function transform_duplicate (imagedata, value) {
var pixels, i;
var pixels, i, l;
pixels = imagedata.data;
for (i = 0; i < pixels.length; i += 4) {
pixels[i] = pixels[i * value];
@ -3261,10 +3277,10 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
}
function transform_HSV (imagedata, hueShift, saturationShift, brightnessShift) {
var pixels, index, r, g, b, max, min, span,
var pixels, index, l, r, g, b, max, min, span,
h, s, v, i, f, p, q, t, newR, newG, newB;
pixels = imagedata.data;
for (index = 0; index < pixels.length; index += 4) {
for (index = 0, l = pixels.length; index < l; index += 4) {
r = pixels[index];
g = pixels[index + 1];
b = pixels[index + 2];
@ -3333,9 +3349,9 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
}
function transform_negative (imagedata, value) {
var pixels, i, rcom, gcom, bcom;
var pixels, i, l, rcom, gcom, bcom;
pixels = imagedata.data;
for (i = 0; i < pixels.length; i += 4) {
for (i = 0, l = pixels.length; i < l; i += 4) {
rcom = 255 - pixels[i];
gcom = 255 - pixels[i + 1];
bcom = 255 - pixels[i + 2];
@ -3360,9 +3376,9 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
}
function transform_comic (imagedata, value) {
var pixels, i;
var pixels, i, l;
pixels = imagedata.data;
for (i = 0; i < pixels.length; i += 4) {
for (i = 0, l = pixels.length; i < l; i += 4) {
pixels[i] += Math.sin(i * value) * 127 + 128;
pixels[i + 1] += Math.sin(i * value) * 127 + 128;
pixels[i + 2] += Math.sin(i * value) * 127 + 128;
@ -3371,9 +3387,9 @@ SpriteMorph.prototype.applyGraphicsEffects = function (canvas) {
}
function transform_confetti (imagedata, value) {
var pixels, i;
var pixels, i, l;
pixels = imagedata.data;
for (i = 0; i < pixels.length; i += 1) {
for (i = 0, l = pixels.length; i < l; i += 1) {
pixels[i] = Math.sin(value * pixels[i]) * 127 + pixels[i];
}
return imagedata;